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Skeletal System
The skeletal system provides definite shape and mechanical support to the body, and it also helps in movement and locomotion. Ask questions about the skeletal system and bones here.
14,490 Questions
What type of bone covers the surface of every bone?
Periosteum is the type of bone that covers the surface of every bone in the body. It is a dense layer of vascular connective tissue that provides nourishment and serves as a protective layer for bones.
Describe where dense irregular connective tissue is found on the surface of a long bone?
Dense irregular connective tissue can be found in the periosteum, which is the outermost layer of the bone. It helps to protect the bone and provide support by anchoring tendons and ligaments to the bone surface.
Leaky capillaries found in the bone marrow are called?
Leaky capillaries found in the bone marrow are called sinusoidal capillaries. These specialized capillaries allow larger cells like blood cells to move in and out of the bloodstream more easily due to their larger size and more permeable nature. This facilitates the movement of cells between the bone marrow and blood circulation.
What are Osteoblasts and Osteoclasts?
Osteoblasts are one type of bone cell (out of three) that is found in bone tissue. They are bone forming cells (make bone) (bone builders). It deposits bone even as another bone cell, osteoclasts, breaks it down. When there is a break, or lacuna, in the bone the osteoblasts form a sheet over the gap. Then osteoids cover the osteoblats trapping them in the lacuna. Inside the lacuna they then turn into osteocytes, a type of bone cell.
osteoblasts are bone forming cells, and osteoclasts are bone destroying cells.
Osteoblasts (from the Greek words for "bone" and "germ" or embryonic) are mononucleate cells that are responsible for bone formation; in essence, osteoblasts are sophisticated fibroblasts that express all genes that fibroblasts express, with the addition of the genes for bone sialoprotein and osteocalcin.[1]
Osteoblasts produce osteoid, which is composed mainly of Type I collagen. Osteoblasts are also responsible for mineralization of the osteoid matrix. Zinc, copper and sodium are some of the many minerals produced. Bone is a dynamic tissue that is constantly being reshaped by osteoblasts, which build bone, and osteoclasts, which resorb bone. Osteoblast cells tend to decrease as individuals become elderly, thus decreasing the natural renovation of the bone tissue.[2]
osteoblasts produce bones in the body. they are bone producing cells
An osteoblast is an immature bone cell. Eventually, the osteoblast will mature into an osteocyte and ossify, or harden, into bone.
Living cells within the bone are engaged in an unceasing process of remodeling. Osteoblasts lining the surface of bone are much like fibroblasts and deposit and organize new bone matrix while osteoclasts demolish old bone matrix. Osteoblasts are converted into osteocytes as they become embedded in this matrix and the matrix calcifies.
A bone that has two large trochanters on its proximal end?
The bone you are referring to is likely the femur, which is the thigh bone. The two large trochanters on the proximal end of the femur are the greater and lesser trochanters, which serve as attachment points for muscles that move the hip joint.
What is the most important bone in human body?
It depends on what you mean by "important". All bones are important as they provide structural support. The eight bones in your wrist, while it seems like a lot, provides the flexibility that allows you to rotate your wrist. Same with the seven tarsal bones in the ankle. The femur is the longest bone in your body (typically). The pelvis holds the intestines and must distribute the upper body weight. Obviously the other bones in your body are just as important; the cranium houses your brain, the spine protects your delicate nervous system, etc.
What kind of tissue is inside the bone?
The part of bone you are asking about is called compact bone, or cortical bone.
True. Long bones are able to grow in length after birth through a process called endochondral ossification, where new bone tissue is produced in the middle of the diaphysis at the epiphyseal plate. This growth continues until the growth plates close at the end of puberty.
How many bones are in a human baby skull?
A new born has around 300 bones. Some of these bones fuse as one gets old bringing the number to 206 in a developed skeleton. The growth of the skeleton ceases between 18-20 years of age. Growth stops in females before the males.
What organ system is found in the thoracic cavity only?
The respiratory system. I believe the cardiovascular system does not fit because it includes the veins and arteries which carry blood throughout the body.
What ribs do not articulate with the sternum?
Floating ribs (ribs 11 and 12) do not articulate with the sternum directly but are attached only to the thoracic vertebrae in the back. They are considered "floating" because they lack an attachment to the sternum or cartilage.
What area of the long bone is covered with cartilage?
The ends of long bones are covered with cartilage, known as articular cartilage. This cartilage helps reduce friction and absorb shock within joints, allowing for smooth movement and protecting the bone from wear and tear.
Bones store calcium in the form of hydroxyapatite, a mineral compound made of calcium and phosphate. This mineral provides strength and rigidity to the bones, while also serving as a reservoir for calcium that can be used by the body when needed for various physiological functions.
Will you find the sternum in the knee?
The sternum is a flat, dagger shaped bone located in the middle of the chest. Along with the ribs, the sternum forms the rib cage that protects the heart, lungs, and major blood vessels from damage.
The sternum is composed of three parts:
The manubrim, also called the "handle", is located at the top of the sternum and moves slightly. It is connected to the first two ribs.
The body, also called the "blade" or the "gladiolus", is located in the middle of the sternum and connects the third to seventh ribs directly and the eighth through tenth ribs indirectly.
The xiphoid process, also called the "tip", is located on the bottom of the sternum. It is often cartilaginous (cartilage), but does become bony in later years.
These three segments of bone are usually fused in adults.
The sternum serves an important function in the body. The ribs are connected to it by the coastal cartilage. Without the sternum, there would be a hole in the bone structure in the middle of your chest, right above your heart and lungs. The sternum protects this vital area and completes the circle of the rib cage.
Facial bone that contains a paranasal sinus?
frontal
Well yes, basically, there are sinuses located within the bones of the face and skull. There are four types. Ethmoid, sphenoid, facial, and maxillary.
the Frontal bone :)
The ribs are attached posteriorly to the what?
The ribs are attached posteriorly to the thoracic vertebrae of the spine through their articulation with the costal facets located on the bodies and transverse processes of the vertebrae. This connection allows for rib movement during breathing and provides structural support for the rib cage.
What is the small hole above the eye on the skull?
The small hole above the eye on the skull is called the supraorbital foramen or notch. It allows passage for nerves and blood vessels that supply sensation to the forehead and scalp above the eye.
What is the purpose of a long bone?
The purpose of a long bone is to support the body and provide structure, as well as assist in movement and mobility. Long bones also play a role in producing red and white blood cells in the bone marrow.
A solid aluminum sphere has a mass of 88g Use the density of aluminum to find radius of sphere?
Density = mass / volume. You have the density of aluminum and the mass of the aluminum sphere. The volume of a sphere is 4/3*Pi*r^3. Therefore volume = 4/3*Pi*r^3 = mass / density. Solve for r, which is the radius of the sphere.
Jellylike substance that supports bone cartilage skin and vessels?
That substance is called connective tissue. It provides structure and support to various body tissues and organs, including bones, cartilage, skin, and blood vessels. It consists of cells and extracellular matrix containing proteins like collagen and elastin.
What is the area where two or more bones join together?
The area where two or more bones join together is called a joint. Joints allow for movement and provide stability to the skeletal system. Examples of joints include the knee, elbow, and shoulder.
